Retirement Benefits and Trusteed Assets (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Pension Plan, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	$ 21	$ 24
Interest Cost	53	48
Expected Return on Plan Assets	(68)	(67)
Amortization of Net Actuarial Losses	38	51
Amortization of Prior Service Cost (Credit)	0	0
Net Periodic Benefit Cost	44	56
Other Postretirement Benefit Plan, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	9	16
Interest Cost	23	24
Expected Return on Plan Assets	(31)	(27)
Amortization of Net Actuarial Losses	5	17
Amortization of Prior Service Cost (Credit)	(36)	(23)
Net Periodic Benefit Cost	$ (30)	$ 7